Note 16 - Deferred Compensation and Supplemental Executive Retirement Plans (Details Textual)	12 Months Ended
Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Certain Executive Officers and Members of The Board of Directors [Member] \| Deferred Compensation Plans [Member]
Deferred Compensation Arrangement with Individual, Maximum Contractual Term	10 years
Deferred Compensation Arrangement with Individual, Employee's Age Limit for Payments	65
Deferred Compensation Arrangement with Individual, Recorded Liability	$ 209,000	$ 258,000
Certain Executive Officers and Members of The Board of Directors [Member] \| Deferred Compensation Plans [Member] \| Salary and Benefits Expense [Member]
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 18,000	$ 23,000
Deferred Compensation Arrangement with Individual, Present Value of Future Cash Flows, Discount Rate	8.00%	8.00%
Executive Officer [Member] \| Skyline National Bank [Member]]
Deferred Compensation Arrangement with Individual, Recorded Liability	$ 222,000	$ 143,000
Executive Officer [Member] \| Skyline National Bank [Member]] \| Salary and Benefits Expense [Member]
Deferred Compensation Arrangement with Individual, Compensation Expense	79,000	107,000
Former Members of Management [Member] \| Supplemental Executive Plans of Bank of Floyd [Member]
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 69,000
Deferred Compensation Arrangement with Individual, Maximum Contractual Term	20 years
Deferred Compensation Arrangement with Individual, Recorded Liability	$ 728,000	768,000
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 29,000	$ 32,000
Deferred Compensation Arrangement with Individual, Present Value of Future Cash Flows, Discount Rate	4.00%
Deferred Compensation Arrangement with Individual, Number of Employees Covered	2
Minimum [Member] \| Certain Executive Officers and Members of The Board of Directors [Member] \| Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member]
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 1,992
Minimum [Member] \| Chief Executive Officer [Member] \| Skyline National Bank [Member]]
Deferred Compensation Arrangement with Individual, Contributions by Employer	12,875
Maximum [Member] \| Certain Executive Officers and Members of The Board of Directors [Member] \| Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member]
Deferred Compensation Arrangement with Individual, Contributions by Employer	37,200
Maximum [Member] \| Chief Executive Officer [Member] \| Skyline National Bank [Member]]
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 80,000

Represents employee's age limit for payments for deferred compensation arrangement with individual.

No definition available.

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- Definition

Represents number of employees covered by deferred compensation arrangement with individual.

+ References

No definition available.

+ Details

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- Definition

Represents discount rate for present value of future cash flows for deferred compensation arrangement with individual.

+ References

No definition available.

+ Details

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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

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- Definition

Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement.

+ References

No definition available.

+ Details

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- Definition

Maximum term of the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367

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- Definition

The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

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